Simulation of Information Bidirectional Transmission Using Single Switch Receiver in a SWIPT System

In order to keep the load voltage stable in the simultaneous wireless information and power transfer (SWIPT) system, the information transmission between the primary and secondary sides is required. A SWIPT system with controlled chopper circuit receiver is proposed in this paper. The secondary side has only one controlled power electronic device that enables chopper control. The relationship between the primary phase angle, the secondary controlled device voltage angle and the load voltage is obtained through theoretical analysis. The secondary side adjusts the voltage angle of the controlled device through the feedback control to achieve a stable load voltage. The signal is modulated by changing the power transmission frequency and the switching frequency of the secondary full controlled device to transfer the information forward and backward respectively. Simulation proves that the proposed structure can realize a stable output of 50V load voltage and bidirectional transmission of information at a rate of 2kbit/s.